隧道变形监测基准网稳定性分析研究

Stability Analysis of Tunnel Deformation Monitoring Reference Network

针对地铁隧道施工场地范围有限的特点,采用测量机器人自由设站法对地铁隧道的变形状态进行跟踪监测,由于自由设站法对基准网稳定性要求较高,因此每次监测作业前需要对基准网稳定性进行检验。本文采用后验单位权方差χ^(2)检验方法对地铁隧道基准网稳定性进行检验,通过对该方法的理论可行性及检验流程进行分析研究,利用基准网的后验单位权方差和先验单位权方差构建统计量,然后进行χ^(2)假设检验,验证了后验单位权方差χ^(2)检验在自由设站法基准网稳定性检验中的适用性及可靠性,有效识别基准网中的不稳定点,为地铁隧道安全分析提供准确可靠的监测数据。

In view of the limited space of construction site of subway tunnel,this paper adopts the measurement robot free station setting method to track and monitor the deformation state of subway tunnel.Because the free station setting method requires high stability of the reference network,the stability of the reference network needs to be inspected before each monitoring operation.This article uses the posteriori unit weight variance χ~2 method for subway tunnel network stability inspection,through the theoretical feasibility of this method and analysis of the inspection process,uses the posteriori unit weight variance reference network and priori unit weight variance χ~2 to build a statistics,conducts the posteriori unit weight variance χ~2 hypothesis testing,verifies the stability and adaptability of posteriori unit weight variance χ~2 testing in the free station setting method reference network,which can effectively identify the unstable points in the network and provide accurate and reliable monitoring data for the metro tunnel safety analysis.